JP2015136866A - Liquid ejection head unit and liquid ejection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid ejection head unit allowing height adjustment of liquid ejection surfaces of a plurality of liquid ejection heads to be easily performed while allowing the plurality of liquid ejection heads to be easily detached, and further to provide a liquid ejection device.SOLUTION: A liquid ejection head unit comprises: a plurality of liquid ejection heads 100 having liquid ejection surfaces 112 formed with nozzle openings ejecting liquid; a head fixing substrate 200 holding opposite surface sides to the liquid ejection surfaces 112 of the plurality of liquid ejection heads 100; and height variable fixing means 300 being provided among the head fixing substrate 200 and the liquid ejection heads 100 and being capable of adjusting intervals among the head fixing substrate 200 and the liquid ejection heads 100. The height variable fixing means 300 are detachably fixed onto opposite surfaces to the liquid ejection surfaces 112 of the liquid ejection heads 100. The height variable fixing means 300 and the head fixing substrate 200 are detachably fixed together by tightening screws from opposite surface sides to fixed surfaces fixed with the liquid ejection heads 100 of the head fixing substrate 200 via the height variable fixing means.

Description

  The present invention relates to a liquid ejecting head unit including a plurality of liquid ejecting heads that eject liquid and a liquid ejecting apparatus including the liquid ejecting unit, and more particularly to an ink jet recording head unit and an ink jet recording apparatus that eject ink as liquid.

  An ink jet recording head unit, which is an example of a liquid ejecting head unit, includes an ink jet recording head that ejects ink droplets from a nozzle opening by a pressure change of a pressure generating unit, and a plurality of ink jet recording heads. There has been proposed one including a head fixing substrate bonded to the side opposite to the liquid ejecting surface (see, for example, Patent Document 1).

  In such an ink jet recording head unit, a long nozzle array is formed by a plurality of ink jet recording heads, thereby improving yield compared to forming a long nozzle array in one ink jet recording head. In addition, the cost can be reduced.

JP 2006-256049 A

  However, when a plurality of ink jet recording heads are bonded to a head fixing substrate to form a long ink jet recording head unit, it is difficult to replace the ink jet recording head because an adhesive is used. There's a problem. In particular, when a plurality of ink jet recording heads are arranged side by side, the entire ink jet recording head unit must be replaced only by a failure of one ink jet recording head, resulting in a high cost. is there.

Further, when the ink jet recording head and the head fixing substrate are bonded with an adhesive, it is necessary to control the protruding amount of the adhesive, and it is difficult to control the protruding amount of the adhesive with high accuracy. There's a problem.
Such a problem exists not only in the ink jet recording head unit but also in a liquid ejecting head unit that ejects liquid other than ink.

  In view of such circumstances, the present invention makes it possible to easily attach and detach a liquid ejecting head, and to easily adjust the height of the liquid ejecting surfaces of a plurality of liquid ejecting heads and a liquid ejecting apparatus. The purpose is to provide.

According to an embodiment of the present invention for solving the above problem, a liquid ejecting head having a liquid ejecting surface in which a nozzle opening for ejecting liquid is formed, and a surface opposite to the liquid ejecting surface of the plurality of liquid ejecting heads are held. A head fixing substrate; and a height variable fixing means provided between the head fixing substrate and the liquid ejecting head and capable of adjusting a distance between the head fixing substrate and the liquid ejecting head. A variable height fixing means is detachably fixed to a surface opposite to the liquid ejecting surface of the liquid ejecting head, and the height variable fixing means and the head fixing substrate are the liquid ejecting surfaces of the head fixing substrate. In the liquid ejecting head unit, the head is detachably fixed by screwing from a surface opposite to a fixing surface for fixing the head via the variable height fixing means.
In this aspect, the liquid ejecting head is fixed to the head fixing substrate by using the height variable fixing means that can be attached to and detached from the head fixing substrate, thereby easily replacing only one liquid ejecting head among the plurality of liquid ejecting heads. It becomes possible. Also, by adjusting the height of the liquid ejecting surfaces of the multiple liquid ejecting heads using the variable height fixing means, the height can be adjusted with higher accuracy than when adjusting the height using the adhesive thickness. In addition, it is not necessary to manage the thickness of the adhesive, and it is possible to suppress problems due to the protrusion of the adhesive.

  Here, a plurality of the liquid ejecting heads are arranged in parallel on the head fixed substrate, and the liquid ejecting heads adjacent to each other in the juxtaposed direction of the liquid ejecting heads when viewed from a direction orthogonal to the liquid ejecting surface. It is preferable that the outer shape serving as the boundary on the liquid ejection surface side of the head is provided to be inclined with respect to the relative movement direction of the ejection target medium. According to this, it becomes possible to arrange the nozzle openings of the ejection heads adjacent in the juxtaposed direction at the same position in the relative movement direction of the ejection medium. As a result, dots formed by landing the liquid ejected from the nozzle openings of the liquid ejecting heads arranged in the juxtaposed direction on the ejected medium can be continuously arranged at similar intervals in the juxtaposed direction. It becomes. In addition, by controlling the ejection of the nozzle openings back to the same position in the relative movement direction, it is possible to reduce the deterioration of the print quality of the dot joint between the liquid ejection heads adjacent in the juxtaposed direction. Therefore, it is possible to easily form a long nozzle row in the juxtaposed direction.

  In addition, a plurality of the liquid ejecting heads are arranged in parallel on the head fixing substrate, and when viewed from a direction orthogonal to the liquid ejecting surface, the variable height fixing means for each liquid ejecting head includes the liquid It is preferable that the nozzles are arranged at positions that fit within the outer shape of the liquid jet head in the direction in which the jet heads are arranged. According to this, the dots formed by landing the liquid ejected from the respective nozzle openings of the liquid ejecting heads arranged in the juxtaposed direction on the ejected medium are continuously arranged at similar intervals in the juxtaposed direction. Is possible. In addition, by controlling the ejection of the nozzle openings back to the same position in the relative movement direction, it is possible to reduce the deterioration of the print quality of the dot joint between the liquid ejection heads adjacent in the juxtaposed direction. Therefore, it is possible to easily form a long nozzle row in the juxtaposed direction.

  The head fixing substrate includes a plurality of liquid ejecting heads arranged in parallel, and when viewed from a direction perpendicular to the liquid ejecting surface, at least a part of the height variable fixing means for each liquid ejecting head is It is preferable that the liquid ejecting head is provided outside the outer shape on the liquid ejecting surface side in the relative movement direction of the ejected medium. According to this, since the liquid ejecting head can be fixed by the height variable fixing means arranged at positions separated from each other, fine adjustment of the height and inclination of the liquid ejecting surface of the liquid ejecting head can be easily performed.

  Further, it is preferable that at least three variable height fixing means are provided for each liquid ejecting head. According to this, the inclination of the liquid ejecting surface of the liquid ejecting head can be adjusted by providing at least three variable height fixing means.

  In addition, the surface on which the variable height fixing unit and the liquid ejecting head are in contact with each other is closer to the liquid ejecting surface than the end on the head fixing substrate side of the liquid ejecting head in the direction orthogonal to the liquid ejecting surface. It is preferable to be located at. According to this, it is possible to suppress an increase in size in the direction orthogonal to the liquid ejecting surface of the liquid ejecting head unit due to the provision of the variable height fixing means.

  Further, it is preferable that the variable height fixing means and the liquid ejecting head are detachably fixed by screwing from the opposite surface side of the variable height fixing means to the liquid ejecting head. According to this, replacement of the variable height fixing means is facilitated by screwing, and the height and inclination of the liquid ejection surface can be easily adjusted. Further, it is possible to suppress the liquid from adhering to the screw and the adhering liquid from dropping to the ejection target medium at an unexpected timing. Further, since the screwing directions are the same between the head fixing substrate and the variable height fixing means and between the variable height fixing means and the liquid ejecting head, the workability is good.

  The liquid ejecting head includes a first member and a second member provided with a flow path, and the height fixing variable means is fixed to the first member, and the first member and the second member The first member is preferably provided with a filter that crosses the flow path. According to this, the filter can be removed from the liquid ejecting head. Therefore, even if a foreign substance enters the flow path of the second member downstream of the filter in the manufacturing stage or the like, the liquid jet head can be easily cleaned by causing the liquid in the flow path to flow backward. It can be carried out.

  Moreover, it is preferable that the said 1st member and the said 2nd member are fastened by the screwing from the surface opposite to the said 2nd member of the said 1st member. According to this, the first member and the second member can be easily attached and detached, and the liquid adheres to the screw, and the adhering liquid can be prevented from dropping onto the ejection target medium at an unexpected timing. . Further, since the screwing direction is the same between the head fixing substrate and the variable height fixing means and between the first member and the second member, workability is good.

According to another aspect of the invention, there is provided a liquid ejecting apparatus including the liquid ejecting head unit according to the above aspect.
According to this aspect, it is possible to realize a liquid ejecting apparatus in which the liquid ejecting head can be easily attached and detached and the liquid ejecting surfaces of the plurality of liquid ejecting heads are aligned to improve the liquid landing accuracy.

1 is a schematic perspective view of a recording apparatus according to Embodiment 1 of the present invention. It is a perspective view of the head unit concerning Embodiment 1 of the present invention. It is a top view of the head unit concerning Embodiment 1 of the present invention. It is a top view of the head unit concerning Embodiment 1 of the present invention. It is sectional drawing and the enlarged view of the head unit which concern on Embodiment 1 of this invention. It is sectional drawing of the head unit which concerns on Embodiment 1 of this invention. It is principal part sectional drawing of the head unit which concerns on Embodiment 2 of this invention. It is principal part sectional drawing of the head unit which concerns on Embodiment 3 of this invention. It is a top view of a head unit concerning other embodiments of the present invention.

Hereinafter, the present invention will be described in detail based on embodiments.
(Embodiment 1)
FIG. 1 is a perspective view illustrating a schematic configuration of an ink jet recording apparatus which is an example of a liquid ejecting apparatus according to Embodiment 1 of the invention.

  In an ink jet recording apparatus that is an example of a liquid ejecting apparatus according to the present embodiment, an ink jet recording head unit that is an example of a liquid ejecting head unit is fixed, and a recording sheet S such as paper that is an ejected medium is conveyed. This is a so-called line-type recording apparatus that performs printing.

  Specifically, as shown in FIG. 1, an ink jet recording apparatus 1 includes an apparatus main body 2 and a plurality of ink jet recording heads 100 and is fixed to the apparatus main body 2 (hereinafter referred to as an ink jet recording head unit 3). , Also simply referred to as the head unit 3), a conveying means 4 that conveys the recording sheet S, and a support member 7 that supports the recording sheet S facing the head unit 3. In the present embodiment, the conveyance direction of the recording sheet S is referred to as a first direction X. A direction orthogonal to the first direction X in the in-plane direction in which the nozzle openings of the head unit 3 are opened is referred to as a second direction Y. Furthermore, a direction orthogonal to the first direction X and the second direction Y is referred to as a third direction Z. In the plane including the third direction Z, the liquid ejection direction side (the recording sheet S side with respect to the head unit 3) is referred to as the Z1 side, and the opposite side is referred to as the Z2 side.

The head unit 3 includes a plurality of ink jet recording heads 100 and a head fixing substrate 200 that holds the plurality of ink jet recording heads 100.
The plurality of ink jet recording heads 100 are juxtaposed in a second direction Y orthogonal to the first direction X, which is the conveyance direction of the recording sheet S, and fixed to the head fixing substrate 200. In the present embodiment, the plurality of inkjet recording heads 100 are arranged side by side on a straight line in the second direction Y. In other words, the plurality of ink jet recording heads 100 are not displaced in the first direction X. Thereby, the width | variety of the 1st direction X of the head unit 3 can be narrowed, and size reduction of the head unit 3 can be achieved.

  Further, the head fixing substrate 200 is provided with the nozzle openings 111 of the plurality of ink jet recording heads 100 so that the liquid ejecting surface on which the nozzle openings 111 of the plurality of ink jet recording heads 100 are formed faces the recording sheet S side. The plurality of liquid ejecting heads 100 are held on the side opposite to the liquid ejecting surface 112. Such a head fixing substrate 200 is fixed to the apparatus main body 2.

  The transport unit 4 transports the recording sheet S in the first direction X with respect to the head unit 3. The transport unit 4 includes, for example, a first transport roller 5 and a second transport roller 6 provided on both sides of the head unit 3 in the first direction X.

  The recording sheet S is transported by the first transport roller 5 and the second transport roller 6 as described above. The transport unit 4 that transports the recording sheet S is not limited to the transport roller, and may be a belt, a drum, or the like.

  The support member 7 supports the recording sheet S conveyed by the conveying unit 4 at a position facing the head unit 3. The support member 7 is made of, for example, a metal or resin having a rectangular cross section provided opposite to the head unit 3 between the first transport roller 5 and the second transport roller 6.

  The support member 7 may be provided with a suction unit that sucks the conveyed recording sheet S on the support member 7. Examples of the suction means include a device that sucks and sucks the recording sheet S and a device that electrostatically sucks the recording sheet S by electrostatic force. For example, when the conveying unit 4 is a belt or a drum, the support member 7 supports the recording sheet S on the belt or the drum at a position facing the head unit 3.

  Further, although not shown, each ink jet recording head 100 of the head unit 3 is connected to a liquid storage means such as an ink tank or an ink cartridge in which ink is stored so as to be able to supply ink. For example, the liquid storage unit may be held on the head unit 3 or may be held at a position different from the head unit 3 in the apparatus main body 2. Further, a flow path or the like for supplying ink supplied from the liquid storage means to the ink jet recording head 100 may be provided inside the head fixed substrate 200. A flow path member may be provided separately from the head fixed substrate 200. The ink from the liquid storage means may be supplied to the ink jet recording head 100 through the flow path member. Of course, the ink may be directly supplied from the liquid storage means to the ink jet recording head 100 without using the head fixing substrate 200 or the flow path member fixed to the head fixing substrate 200.

  In the ink jet recording apparatus 1 of this embodiment, the recording sheet S is transported by the first transport roller 5, and printing is performed on the recording sheet S supported on the support member 7 by the head unit 3. The printed recording sheet S is conveyed by the second conveyance roller 6.

  Here, the head unit 3 mounted on the ink jet recording apparatus 1 will be described in detail with reference to FIGS. 2 is an exploded perspective view showing an ink jet recording head unit which is an example of the liquid ejecting head unit according to Embodiment 1 of the present invention, and FIG. 3 is a liquid ejecting surface side of the ink jet recording head unit. 4 is a plan view of the ink jet recording head unit on the side of the head fixing substrate, FIG. 5 is a cross-sectional view taken along line AA ′ of FIG. 4 and an enlarged view thereof, and FIG. FIG. 5 is a cross-sectional view taken along line BB ′ of FIG. 4.

  As illustrated, the head unit 3 of the present embodiment includes a plurality of ink jet recording heads 100, a head fixing substrate 200 that holds the plurality of ink jet recording heads 100, a head fixing substrate 200, and the ink jet recording head 100. And a spacer 300 which is a height variable fixing means provided between the two.

  The ink jet recording head 100 has a liquid ejection surface 112 provided with a nozzle opening 111 on the Z1 side in the third direction Z. The nozzle opening 111 and the liquid ejection surface 112 are provided in the head main body 110 provided in the ink jet recording head 100 described later in detail. In addition, the ink jet recording head 100 of the present embodiment is formed so that the outer shape thereof is substantially the same from the Z1 side that is the liquid ejecting surface 112 side to the Z2 side that is the head fixing substrate 200 side. That is, the side surfaces on both sides in the first direction X and the side surfaces on both sides in the second direction Y of the ink jet recording head 100 are formed so as to be substantially flat along the third direction Z.

  Such an ink jet recording head 100 is fixed via a spacer 300 on the surface of the head fixing substrate 200 facing the recording sheet S, that is, on the Z1 side that is the recording sheet S side in the third direction Z. Yes. In addition, the ink jet recording head 100 is fixed to the head fixing substrate 200 with the Z2 side surface opposite to the liquid ejecting surface 112 abutting against the spacer 300.

The spacer 300 includes a first fixing portion 301 and a second fixing portion 302 that is thicker in the third direction Z than the first fixing portion 301.
In such a spacer 300, the first surface 303 on the Z1 side is fixed in contact with the surface on the Z2 side, which is the opposite side to the liquid ejecting surface 112 of the ink jet recording head 100. In the present embodiment, the first recess 101 that opens to the surface on the Z2 side of the ink jet recording head 100 is provided, the spacer 300 is inserted into the first recess 101, and Z1 in the third direction Z of the first recess 101 is obtained. The first surface 303 of the spacer 300 is brought into contact with and fixed to the bottom surface 102 which is the side.

  Here, the first fixing portion 301 is provided with a first insertion hole 304 that penetrates in the third direction Z. In addition, the ink jet recording head 100 is provided with a first fixing hole 103 that opens in the bottom surface 102 of the first recess 101. Then, the first screw member 401, which is a male screw, is inserted from the Z2 side of the first fixing portion 301, and the first screw member 401 is screwed into the first fixing hole 103 of the ink jet recording head 100, whereby the spacer The first surface 303 of 300 is fixed in contact with the bottom surface 102 of the first recess 101 of the ink jet recording head 100. That is, the spacer 300 is detachably fixed to the inkjet recording head 100 by screwing the spacer 300 from the Z2 side with the first screw member 401. That is, the spacer 300 of this embodiment can be removed from the inkjet recording head 100 at a desired timing by releasing the screwing by the first screw member 401. In the present embodiment, the first screw member 401 is inserted into the first insertion hole 304 of the spacer 300 so that the first screw member 401 is screwed into the first fixing hole 103 of the ink jet recording head 100. However, it is not particularly limited to this. For example, the first screw member is fixed on the Z2 side surface of the ink jet recording head 100 so that the tip protrudes toward the spacer 300. Then, the first screw member is inserted into the first insertion hole 304 from the first surface 303 side of the spacer 300, and a nut that is a female screw is screwed into the tip of the inserted first screw member, whereby the ink jet recording head 100. The spacer 300 may be detachably fixed. As described above, even when the first screw member 401 is inserted from the Z2 side opposite to the ink jet recording head 100 of the spacer 300 and screwed, the first screw member is inserted from the Z1 side of the spacer 300. In either case, the spacer 300 and the ink jet recording head 100 are opposite to the ink jet recording head 100 on the Z2 side of the spacer 300 in either case. It is fixed by screwing from the Z2 side.

  Such a spacer 300 is an ink jet recording head in a second direction Y, which is a juxtaposition direction of the ink jet recording head 100, when viewed from a third direction Z that is a direction orthogonal to the liquid ejection surface 112. It is arranged at a position that fits within the outer shape of 100. That is, when viewed from the third direction Z, the spacer 300 is arranged at a position that does not protrude from the outer shape of the ink jet recording head 100 in the second direction Y. In the present embodiment, the spacer 300 is fixed so as to be accommodated in the first concave portion 101 provided on the surface opposite to the liquid ejecting surface 112 of the ink jet recording head 100, whereby the spacer 300 is fixed to the ink jet recording head 100. It arrange | positions in the position which does not protrude from the side surface of the 2nd direction Y. The outer shape of the ink jet recording head 100 refers to a portion of the ink jet recording head 100 that protrudes most in the first direction X and the second direction Y. In this embodiment, as will be described in detail later, the ink jet recording head 100 includes a plurality of head main bodies 110 having a liquid ejecting surface 112, a holder 120 that is a holding member that holds the head main body 110, and a liquid in the head main body 110. The cover 130 is provided on the ejection surface 112 side and exposes the liquid ejection surface 112. The outer shape in the second direction Y of the ink jet recording head 100 includes the head main body 110, the holder 120, and the cover. Of 130 and the like, the one that protrudes most in the second direction Y is said. Incidentally, the ink jet recording head 100 of the present embodiment is formed so that the outer shape thereof is substantially the same from the Z1 side, which is the liquid ejection surface 112 side, to the Z2 side, which is the head fixing substrate 200 side, as described above. Therefore, the spacer 300 may be arranged so as not to protrude from the holder 120 in the second direction Y, for example.

  In this way, when viewed from the third direction Z, the spacer 300 is disposed at a position that does not protrude from the side surface in the second direction Y of the ink jet recording head 100, so that the ink jets adjacent in the second direction Y are arranged. The interval between the recording heads 100 can be reduced. Accordingly, the head main bodies 110 of the ink jet recording heads 100 adjacent in the second direction Y can be provided close to each other, and the nozzle openings 111 provided in the head main bodies 110 of the adjacent ink jet recording heads 100 are provided. The dots can be provided close to the second direction Y. As will be described in detail later, dots arranged in parallel in the second direction Y of the head unit 3 at similar intervals can be formed continuously.

  Incidentally, when the spacer 300 is provided so as to protrude from the side surface in the second direction Y of the ink jet recording head 100 when viewed from the third direction Z, the adjacent ink jet on the straight line in the second direction Y. In order to prevent the spacers 300 of the recording head 100 from interfering with each other, the interval between the ink jet recording heads 100 adjacent to each other in the second direction Y must be widened. There is a possibility that the provided dots cannot be continuously formed, and the second direction Y of the head unit 3 is increased in size.

  In the present embodiment, the spacer 300 is a relative movement direction of the recording sheet S relative to the head unit 3 when viewed from the third direction Z that is a direction orthogonal to the liquid ejecting surface 112, that is, conveyance of the recording sheet S. In the first direction X, which is the direction, the ink jet recording head 100 is disposed at a position that falls within the outer shape on the liquid ejection surface 112 side. Thereby, the width of the head unit 3 in the first direction X can be reduced, and the distance in the first direction X between the first transport roller 5 and the second transport roller 6 in the ink jet recording apparatus 1 can be reduced. Can be shortened. Therefore, it becomes easy to fix the posture of the recording sheet S between the first transport roller 5 and the second transport roller 6, and the print quality can be improved. In addition, the head unit 3 and the ink jet recording apparatus 1 can be reduced in size. The outer shape of the ink jet recording head 100 on the liquid ejecting surface 112 side is the most protruding in the first direction X and the second direction Y on the liquid ejecting surface 112 side in the third direction Z of the ink jet recording head 100. Say what you did. In the present embodiment, the ink jet recording head 100 includes a head main body 110 having a liquid ejecting surface 112, a holder 120 that holds the head main body 110, and the liquid ejecting surface 112 provided on the liquid ejecting surface 112 side of the head main body 110. And a cover 130 that exposes. The ink jet recording head 100 according to this embodiment is formed so that the outer shape thereof is substantially the same from the Z1 side, which is the liquid ejecting surface 112 side, to the Z2 side, which is the head fixing substrate 200 side. Therefore, the outer shape on the liquid ejecting surface 112 side of the ink jet recording head 100 in the present embodiment is the outer shape of the cover 130 or the outer shape of the holder 120 on the cover 130 side. However, in the third direction Z, when the outer shape on the Z2 side protrudes in the first direction X rather than the outer shape on the Z1 side that is the liquid ejecting surface 112 side of the ink jet recording head 100, the inkjet The outer shape on the liquid ejecting surface 112 side of the recording head 100 is the outer shape of the portion provided on the Z2 side and protruding in the first direction X. However, in the case where the ink jet recording head 100 is provided so as to protrude in the first direction X at a position that does not interfere with the first transport roller 5 and the second transport roller 6, the projecting portion is a liquid jet It is not called the outer shape on the surface 112 side. That is, the outer shape on the liquid ejection surface 112 side of the ink jet recording head 100 is an outer shape at a position where the first conveying roller 5 and the second conveying roller 6 interfere with each other.

  Such a spacer 300 is in a state where the second surface 305 opposite to the first surface 303 of the second fixing portion 302 is in contact with the fixing surface 201 on the Z1 side that is the recording sheet S side of the head fixing substrate 200. It is detachably fixed. Accordingly, the ink jet recording head 100 is detachably fixed to the head fixing substrate 200 via the spacer 300.

  Here, the second fixing portion 302 of the spacer 300 is provided with a second fixing hole 306 that opens to the head fixing substrate 200 side. The head fixing substrate 200 is provided with a second insertion hole 202 at a position facing the second fixing hole 306 in the third direction Z. Then, the second screw member 402 that is a male screw is inserted from the Z2 side of the head fixing substrate 200, and the second screw member 402 is screwed into the second fixing hole 306 provided in the spacer 300, whereby the spacer 300 is The second surface 305 is fixed in contact with the fixed surface 201 of the head fixing substrate 200. That is, the spacer 300 is detachably fixed by the second screw member 402 by screwing from the Z2 side of the head fixing substrate 200. That is, the spacer 300 of this embodiment can be removed from the head fixing substrate 200 at a desired timing by releasing the screwing of the second screw member 402. In the present embodiment, the second screw member 402 is inserted into the second insertion hole 202 of the head fixing substrate 200, and the second screw member 402 is screwed into the second fixing hole 306 of the spacer 300. However, it is not particularly limited to this. For example, the second screw member is fixed to the Z2 side surface of the spacer 300 so that the tip protrudes toward the head fixing substrate 200 side. Then, the second screw member is inserted into the second insertion hole 202 from the Z1 side of the head fixing substrate 200, and a nut, which is a female screw, is screwed into the tip of the inserted second screw member, whereby a spacer is attached to the head fixing substrate 200. You may make it fix 300 so that attachment or detachment is possible. As described above, even when the second screw member 402 is inserted from the Z2 side of the head fixing substrate 200 and screwed, the second screw member is inserted from the Z1 side of the head fixing substrate 200 to the Z2 side of the head fixing substrate 200. In either case, the head fixing substrate 200 and the spacer 300 are separated from the Z2 side, which is the opposite surface side of the ink jet recording head 100, of the head fixing substrate 200. It is fixed by screwing.

  As described above, the spacer 300 is detachably provided on the ink jet recording head 100, and the spacer 300 is detachably provided on the head fixing substrate 200, so that the ink jet recording head 100 can be easily attached and detached from the head fixing substrate 200. can do. As a result, when a plurality of ink jet recording heads 100 provided in the head unit 3 break down, only the broken ink jet recording heads 100 can be selectively replaced. That is, since it is not necessary to replace the entire head unit 3 due to a failure of one ink jet recording head 100, the cost can be reduced. In addition, even when the head unit 3 is assembled, it is possible to selectively replace the ink jet recording head 100 that does not have the same ink droplet ejection characteristics, thereby improving the yield. That is, if there are variations in the ejection characteristics of the ink droplets of the plurality of ink jet recording heads 100 incorporated in the head unit 3, the print quality deteriorates. However, the ejection characteristics are measured and the print quality is inspected. This is because it may be performed in an assembled state. In addition, since no adhesive is used for fixing the head fixing substrate 200 and the ink jet recording head 100, it is not necessary to perform complicated management such as the thickness of the adhesive and the protrusion, and the assembly process can be simplified. .

  In this embodiment, since the spacer 300 fixed to the ink jet recording head 100 is fixed to the head fixing substrate 200 by screwing from the side opposite to the fixing surface 201 on the Z1 side, the spacer 300 is fixed to the ink jet recording head. The spacer 300 can be disposed within the outer shape of the ink jet recording head 100 in the second direction Y without protruding from the second direction Y on the liquid ejecting surface 112 side of the head 100. Accordingly, it is possible to reduce the interval between the adjacent ink jet recording heads 100 arranged in parallel in the second direction Y, and to reduce the width of the head unit 3 in the first direction X. Incidentally, for example, when the spacer 300 fixed to the ink jet recording head 100 is to be fixed by screwing from the Z1 side, the spacer 300 is arranged in the first direction X and the second direction Y of the ink jet recording head 100. The first surface 303 must be exposed by protruding from either one or both. For example, when the spacer 300 protrudes from the second direction Y of the ink jet recording head 100, the interval between the ink jet recording heads 100 arranged in parallel in the second direction Y is widened. Further, when the spacer 300 protrudes from the first direction X of the ink jet recording head 100, the width of the head unit 3 in the first direction X becomes large.

  In the present embodiment, the first screw member 401 that fixes the ink jet recording head 100 and the spacer 300 and the second screw member 402 that fixes the head fixing substrate 200 and the spacer 300 are all of the ink jet recording head 100. It is detachably fixed by screwing from the side opposite to the liquid ejecting surface 112. Accordingly, it is possible to suppress problems such as the ink adhering to the first screw member 401 and the second screw member 402 dropping onto the recording sheet S or the like at an unexpected timing. In addition, the first screw member 401 and the second screw member 402 have good workability because the screwing directions are the same.

  Note that the difference in thickness between the first fixing portion 301 and the second fixing portion 302 in the third direction Z of the spacer 300 is the head of the first screw member 401 that is inserted into the first fixing portion 301 and fixed. It only needs to be larger than the part. Thereby, when the spacer 300 fixed to the ink jet recording head 100 is fixed to the head fixing substrate 200, the first screw member 401 can be prevented from coming into contact with the head fixing substrate 200.

  The first recess 101 provided in the ink jet recording head 100 and into which the spacer 300 is inserted is formed shallower than the thickness of the second fixing portion 302 in the third direction Z. Thus, when the spacer 300 is inserted into the first recess 101 and fixed, the second surface 305 of the spacer 300 is closer to the Z2 side than the surface opposite to the liquid ejection surface 112 of the ink jet recording head 100. Therefore, when the spacer 300 is fixed to the head fixing substrate 200, the ink jet recording head 100 can be prevented from coming into contact with the head fixing substrate 200. Accordingly, the height of the liquid ejecting surface 112 of the ink jet recording head 100 in the third direction Z and the inclination of the liquid ejecting surface 112 can be adjusted using the spacers 300 having different thicknesses. That is, when the ink jet recording head 100 contacts the head fixing substrate 200 before the spacer 300, the third of the liquid ejection surface 112 of the ink jet recording head 100 with respect to the head fixing substrate 200 is used by using the spacer 300 having a different thickness. This is because the height in the direction Z cannot be adjusted.

  Thus, the spacer 300 fixed to the ink jet recording head 100 is brought into contact with the fixing surface 201 of the head fixing substrate 200 and fixed without bringing the ink jet recording head 100 into contact with the head fixing substrate 200. The distance in the third direction Z between the ink jet recording head 100 and the head fixing substrate 200 can be adjusted using the spacers 300 having different thicknesses of the second fixing portions 302. That is, if the spacer 300 having a relatively small thickness in the third direction Z of the second fixing portion 302 is used, the interval between the ink jet recording head 100 and the head fixing substrate 200 can be narrowed. If the spacer 300 having a relatively large thickness 302 is used, the interval between the ink jet recording head 100 and the head fixing substrate 200 can be widened. That is, the spacer 300 according to the present embodiment is a height varying unit that can adjust the interval between the ink jet recording head 100 and the head fixing substrate 200, and a fixing unit that fixes the ink jet recording head 100 to the head fixing substrate 200. Including these two means, it is a variable height fixing means.

  As described above, since the height of the liquid ejecting surface 112 of the ink jet recording head 100 fixed to the head fixing substrate 200 by the spacer 300 can be adjusted, a plurality of ink jet recording heads fixed to the head fixing substrate 200. The height of the 100 liquid ejection surfaces 112 in the third direction Z with respect to the recording sheet S can be easily aligned. Accordingly, it is possible to improve the printing quality by suppressing the landing position deviation of the ink droplets ejected from each ink jet recording head 100.

  In this embodiment, four spacers 300 are provided for one ink jet recording head 100. Specifically, the spacer 300 is provided in each of the four corners in the plane of the first direction X and the second direction Y of the ink jet recording head 100. As described above, four spacers 300 are provided for one ink jet recording head 100, and the spacers 300 having different thicknesses are used for the four spacers 300, so that the liquid of the ink jet recording head 100 can be used. The inclination of the ejection surface 112 can be adjusted. That is, as the two spacers 300 provided on one end portion side in the first direction X, the second fixing portion 302 having a relatively small thickness is provided on the other end portion side in the first direction X. When two spacers 300 having a relatively thick second fixing portion 302 are used, the liquid ejecting surface 112 is inclined so as to face the one end portion side in the first direction X. By similarly adjusting in the second direction Y, the liquid ejection surface 112 can be inclined in an arbitrary direction. That is, by using four spacers 300 for one ink jet recording head 100, the inclination of the liquid ejection surfaces 112 of the plurality of ink jet recording heads 100 fixed to the head fixing substrate 200 can be made uniform. Accordingly, the inclination of the liquid ejecting surfaces 112 of the plurality of ink jet recording heads 100 fixed to the head fixing substrate 200 with respect to the recording sheet S can be easily aligned. It is possible to improve the printing quality by suppressing landing position deviation.

  Here, the ink jet recording head 100 is configured by laminating a plurality of members, and the case where the dimension in the third direction Z differs due to the dimensional tolerance of each member, the variation in the thickness of the adhesive, or the like, The ejection surface 112 may be provided with an inclination. For this reason, when the plurality of ink jet recording heads 100 are fixed to the common head fixing substrate 200 using the spacers 300 having the same thickness, the height of the liquid ejection surfaces 112 of the plurality of ink jet recording heads 100 in the third direction Z is increased. The thickness of the liquid ejecting surface 112 may vary, and the inclination of the liquid ejection surface 112 may vary. Such variation of the liquid ejecting surface 112 is a problem peculiar to the head unit of the present embodiment in which the surface opposite to the liquid ejecting surface 112 is fixed to the head fixing substrate 200. Such a problem does not occur in the head unit that holds the liquid ejection surface 112 with a common member. However, when the liquid ejecting surfaces 112 of a plurality of ink jet recording heads are held by a common member, the distance between the liquid ejecting surface 112 and the recording sheet S is increased by the size of the common member, and the ink In some cases, such as a drop in landing accuracy may occur. Further, the head unit 3 and the ink jet recording head 1 may be increased in size in the first direction X by the size of the common member. In the present embodiment, not the liquid ejecting surface 112 but the surface opposite to the liquid ejecting surface 112 is fixed to the head fixing substrate 200, so that the interval between the liquid ejecting surface 112 and the recording sheet S can be reduced. The landing accuracy of the droplet on the recording sheet S can be improved. Further, the head unit 3 can be reduced in size by narrowing the width of the head unit 3 in the first direction X.

  In the present embodiment, one ink jet recording head 100 is fixed to the head fixing substrate 200 using a plurality of spacers 300, so that the height of the liquid ejection surface 112 of the ink jet recording head 100 fixed to the head fixing substrate 200 is increased. It is possible to easily suppress the variation in the thickness and the variation in the inclination of the liquid ejecting surface 112. Therefore, the landing position deviation of the ink droplets on the recording sheet S can be suppressed and highly accurate landing can be performed. That is, when the ink jet recording head 100 is bonded to the head fixing substrate 200 with an adhesive, the height and inclination of the liquid ejection surfaces 112 of the plurality of ink jet recording heads 100 must be adjusted according to the thickness of the adhesive. High precision adjustment cannot be performed. In addition, since the thickness of the adhesive and the adjustment of the height and inclination of the liquid ejecting surface 112 are related to each other, the adjustment of the height and inclination of the liquid ejecting surface 112 may cause problems such as the adhesive protruding. There is. Furthermore, since the thickness of the adhesive is limited, the liquid ejecting surface 112 may not be evenly aligned with the adhesive alone. In the present embodiment, since the height and inclination of the liquid ejecting surface 112 of the ink jet recording head 100 can be easily adjusted with high accuracy using the spacer 300 that is a variable height fixing means, there is a problem due to the protrusion of the adhesive. In addition, it is possible to suppress problems such as that the height of the liquid ejecting surface 112 cannot be made uniform due to the limitation on the thickness of the adhesive.

  Note that, by providing at least three spacers with respect to one ink jet recording head 100, the inclination of the liquid ejecting surface 112 in all directions can be adjusted. By providing the four spacers 300 corresponding to the four corners of the recording head 100, it becomes easy to adjust the inclination of the liquid ejecting surface 112, and the ink jet recording head 100 is firmly fixed to the head fixing substrate 200. can do. That is, in order to adjust the inclination of the liquid ejecting surface 112 by the spacer 300, it is preferable to dispose the spacer 300 at a position as far as possible on the fixed surface 201 of the head fixing substrate 200. Thereby, the fine adjustment of the inclination of the liquid ejection surface 112 can be easily performed. Further, by fixing the ink jet recording head 100 to the head fixing substrate 200 with the four spacers 300, it is possible to suppress the ink jet recording head 100 from being easily displaced due to an impact or the like.

  In the present embodiment, the first recess 101 into which the spacer 300 is inserted is provided on the opposite side of the ink jet recording head 100 from the liquid ejection surface 112, and the spacer 300 is fixed in the first recess 101. Is done. In other words, the first surface 303 on the Z1 side of the spacer 300 is in contact with the Z1 side in the third direction Z from the surface that protrudes most on the Z2 side of the ink jet recording head 100. Thereby, the height of the head unit in the third direction Z can be reduced. That is, when the first surface of the spacer 300 is brought into contact with the surface of the ink jet recording head 100 that protrudes to the most Z2 side without providing the first recess 101 in the ink jet recording head 100, the head is moved by the amount of the spacer 300. This is because the unit is enlarged in the third direction Z. Incidentally, in the present embodiment, a protrusion 104 having a flow channel 500 therein is provided on the side opposite to the liquid ejection surface 112 of the ink jet recording head 100. Since the protrusion 104 is inserted into the through hole 203 provided in the head fixing substrate 200, the protrusion 104 is not included on the surface opposite to the liquid ejecting surface 112 of the ink jet recording head 100. That is, the surface opposite to the liquid ejecting surface 112 of the ink jet recording head 100 is a surface provided on the Z1 side in the third direction Z with respect to the fixing surface 201 of the head fixing substrate 200.

  As described above, the plurality of ink jet recording heads 100 are arranged in a straight line in the second direction Y and are detachably fixed to the head fixing substrate 200. In other words, the plurality of ink jet recording heads 100 are not displaced in the first direction X. Thereby, the width | variety of the 1st direction X of the head unit 3 can be narrowed, and size reduction of the head unit 3 can be achieved. Of course, the ink jet recording heads 100 arranged in parallel in the second direction Y may be shifted in the first direction X, but if the ink jet recording head 100 is greatly shifted in the first direction X, The width in the first direction X of the head fixing substrate 200 or the like becomes wide. As described above, when the size of the head unit 3 in the first direction X increases, the distance in the first direction X between the first transport roller 5 and the second transport roller 6 in the inkjet recording apparatus 1 increases. Therefore, it becomes difficult to fix the posture of the recording sheet S. Further, the head unit 3 and the ink jet recording apparatus 1 are increased in size.

  In the present embodiment, four ink jet recording heads 100 are fixed to the head fixing substrate 200. However, the number of ink jet recording heads 100 is not particularly limited as long as the number is two or more. is not.

Here, an example of the ink jet recording head 100 mounted on such a head unit will be described in more detail.
As shown in FIGS. 2, 5, and 6, the ink jet recording head 100 includes a plurality of head main bodies 110, a holder 120 that is a holding member of the present embodiment that holds the plurality of head main bodies 110, and the head main body 110. And a cover 130 provided on the liquid ejection surface 112 side.

  The head main body 110 has a liquid ejecting surface 112 provided with a nozzle opening 111 on the Z1 side in the third direction Z. Further, the Z2 side of the plurality of head main bodies 110 is bonded to the Z1 side surface of the holder 120.

  The holder 120 has a holding part 121 that forms a groove-like space on the Z1 side. The holding part 121 is provided on the Z1 side surface of the holder 120 continuously in the second direction Y so as to be opened on both side surfaces in the second direction Y. Further, the holder 120 is provided with a holding portion 121 at a substantially central portion in the first direction X, so that a foot portion 122 is formed on both sides of the holding portion 121 in the first direction X. That is, the feet 122 are provided on the Z1 side surface of the holder 120 only at both ends in the first direction X, and are not provided at both ends in the second direction Y.

  A plurality of head main bodies 110 are bonded to each other with the adhesive 140 in the holding section 121. That is, the foot 122 is located on both sides in the first direction X with respect to the head main body 110. Note that the holder 120 and the head main body 110 are bonded to each other in the third direction Z by an adhesive 140. A flow path 500 for supplying ink to the head main body 110 and the like are provided inside the holder 120, and the flow path 500 of the holder 120 and a flow path (not shown) of the head main body 110 are sealed with an adhesive 140. Stopped and communicated.

In addition, the holder 120 includes a first member 125 provided on the Z2 side in the third direction Z and a second member 126 provided on the Z1 side that is the head main body 110 side.
The first member 125 and the second member 126 are detachably fixed. In the present embodiment, in the third direction Z, the first member 125 and the second member 126 are detachably fixed by screwing from the Z2 side opposite to the second member 126 of the first member 125. did. Specifically, the first member 125 is provided with a third insertion hole 127 that penetrates in the third direction Z. The second member 126 is provided with a third fixing hole facing the third insertion hole 127 in the third direction Z. Then, a third screw member 403 that is a male screw is inserted into the third insertion hole 127 from the Z2 side of the first member 125, and the third screw member 403 is screwed into the third fixing hole 128 of the second member 126. The first member 125 and the second member 126 are detachably fixed. The third insertion hole into which the third screw member 403 of the first member 125 is inserted is provided at the bottom surface in the third direction Z of the second recess 105 that is deeper than the first recess 101. Thereby, when the spacer 300 is fixed to the holder 120, it can suppress that the 3rd screw member 403 contact | abuts to the spacer 300. FIG. That is, the depth of the second recess 105 with respect to the bottom surface of the first recess 101 in the third direction Z is provided to be deeper than the thickness of the head portion of the third screw member 403.

  Such a holder 120 is provided with a flow channel 500 for supplying ink from the liquid storage means to the head body 110 across the first member 125 and the second member 126. A filter 501 that crosses the flow path 500 is provided on the surface of the first member 125 on the second member 126 side. Such a filter 501 removes foreign matters such as dust and bubbles contained in the ink flowing through the flow path 500. However, if foreign matter enters the flow path of the second member 126 on the downstream side of the flow path with respect to the filter 501 in the manufacturing stage before the filter 501 is provided, the foreign matter is disposed in the nozzle provided on the head main body 110. Opening 111 may be clogged.

  Since the ink jet recording head 100 having such a holder 120 can be detached from the head fixing substrate 200 by the spacer 300 as described above, the holder 120 of the ink jet recording head 100 removed from the head fixing substrate 200 is used as the first member. By separating the first member 125 and the second member 126, the flow path of the second member 126 that is downstream of the filter 501 is cleaned, thereby removing foreign matters in the flow path of the second member 126. can do. That is, even if foreign matter enters the flow path of the second member 126 to which the plurality of head main bodies 110 are bonded, the first member 125 and the second member 126 are divided, and the filter 501 is removed from the second member 126. Compared to the case where the foreign matter in the flow path of the second member 126 cannot be removed by removing and removing the foreign matter in the flow path of the second member 126, the second member 126 to which the plurality of head bodies 110 are bonded is compared. Yield can be improved. Incidentally, the cleaning of the flow path of the second member 126 can be performed by, for example, backwashing that causes the ink to flow backward from the nozzle opening 111 side.

  In the present embodiment, the first member 125 and the second member 126 are detachably fixed by screwing the first member 125 from the opposite side of the first member 125 with the third screw member 403. Yes. Accordingly, it is possible to suppress the third screw member 403 from touching the ink, and it is possible to suppress problems such as the ink adhering to the third screw member 403 dropping onto the recording sheet S at an unexpected timing. The third screw member 403 has the same screwing direction as the first screw member 401 that fixes the ink jet recording head 100 and the spacer 300 and the second screw member 402 that fixes the head fixing substrate 200 and the spacer 300. Workability is good. Note that the first member 125 and the second member 126 may each have a plurality of members stacked in the third direction Z. For example, the filter 501 is provided at the boundary between the members constituting the first member 125. Even if the filter 501 is not provided at the boundary between the first member 125 and the second member 126, the plurality of head main bodies 110 can be bonded by dividing the first member 125 and the second member 126. The filter 501 can be removed from the formed second member 126.

  In this manner, the head main body 110 held by the holder 120 is configured by laminating a plurality of members, although not particularly illustrated. The plurality of head main bodies 110 have variations in the height in the third direction Z due to dimensional tolerances of a plurality of members constituting each head main body 110 and variations in the thickness of an adhesive or the like that laminates the plurality of members. It will occur. In this way, the plurality of head bodies 110 having height variations in the third direction Z are held by the common holder 120, and the liquid ejection surfaces 112 of the plurality of head bodies 110 are aligned on a plane, that is, the liquid ejection In order to make the height of the surface 112 in the third direction Z uniform, it is necessary to absorb the height variation of the head body 110 by the adhesive 140 that bonds the holder 120 and the head body 110 together.

  Incidentally, although it is conceivable to fix the holder 120 and the head main body 110 with screws or the like, the head main body 110 is small, and in this embodiment, it is necessary to attach a plurality to the single holder 120. It is difficult to fix with a screw or the like through a sealing member made of Therefore, the head main body 110 and the holder 120 are bonded to each other with the adhesive 140, so that the number of parts is reduced and the cost is reduced without providing a seal member made of an elastic material between the two. It is possible to seal the flow path.

  In addition, a plurality of head main bodies 110 are juxtaposed in the second direction Y and bonded in the holding portion 121 of the holder 120. In the present embodiment, six head bodies 110 are bonded to one holder 120. Of course, the number of head main bodies 110 to be fixed to one holder 120 is not limited to that described above, and there may be one head main body 110 for one holder 120 or two or more. May be. Incidentally, by providing a plurality of head main bodies 110 for one ink jet recording head 100 to increase the number of nozzle arrays, only one head main body 110 for one ink jet recording head 100 is provided. The yield can be improved as compared with the case where a plurality of columns are provided to increase the number of columns. That is, increasing the number of nozzle rows in the single head main body 110 decreases the yield of the head main body 110 and increases the manufacturing cost. On the other hand, by fixing a plurality of head main bodies 110 to a common holder 120 and increasing the number of nozzle rows by the plurality of head main bodies 110, the yield of the head main bodies 110 is improved and the manufacturing cost is reduced. be able to.

  Note that the plurality of head main bodies 110 of the present embodiment are fixed so that the nozzle rows are inclined with respect to the first direction X that is the conveyance direction of the recording sheet S in the in-plane direction of the liquid ejecting surface 112. . That is, with respect to the first direction X, the fourth direction Xa, which is a parallel arrangement direction of the nozzle openings 111 constituting the nozzle row, is a tilting direction. In the present embodiment, the ink jet recording head 100 includes a plurality of head bodies 110 arranged in parallel in the second direction Y, and at least nozzle openings 111 of the head bodies 110 adjacent to each other in the second direction Y. Part of each other can be arranged at a position overlapping in the first direction X.

  Further, the outer shape of the ink jet recording head 100 viewed from the third direction Z is provided such that the side surface in the second direction Y has the same inclination as the fourth direction Xa. In other words, when viewed from the third direction Z orthogonal to the liquid ejecting surface 112, the ink jet recording head 100 has an outer shape that becomes a boundary between the ink jet recording heads 100 adjacent to each other in the second direction Y. It is inclined with respect to the first direction X, which is the transport direction of S. That is, when viewed from the third direction Z, the side surface that forms the outer shape on the second direction Y side of the ink jet recording head 100 has a surface direction in the fourth direction Xa with respect to the first direction X. Inclined. Thereby, at least a part of the nozzle openings 111 of the ink jet recording heads 100 adjacent in the second direction Y can be arranged at positions overlapping in the first direction X.

  As a result, dots formed by landing the ink ejected from the respective nozzle openings 11 of the ink jet recording heads 100 arranged in parallel in the second direction Y on the recording sheet S have the same spacing in the second direction Y. Can be arranged continuously. Further, by performing control to alternately perform the injection from the nozzle openings 111 arranged at the overlapping positions in the first direction X or to perform exclusively at the ratio of the inclination distribution, it is adjacent to the second direction Y. The banding that may occur at the joints of dots between the ink jet recording heads 100 is made inconspicuous, and the deterioration of print quality can be reduced. Thereby, a long nozzle row in the second direction Y can be easily formed. It should be noted that the outer shape that becomes the boundary between the ink jet recording heads 100 adjacent to each other in the second direction Y is inclined along the fourth direction Xa, and the nozzle openings of the ink jet recording heads 100 adjacent in the second direction Y are inclined. In order to dispose at least a part of 111 in a position overlapping each other in the first direction X, as described above, the ink jet recording head 100 is not projected from the side surface in the second direction Y of the ink jet recording head 100. This can be realized by arranging the recording head 100 at a position that fits within the outer shape in the second direction Y.

  In addition, as shown in FIG. 3, the ink jet recording head 100 of the present embodiment has a shape that is a substantially parallelogram when viewed from the liquid ejection surface 112 side. Of course, the shape of the ink jet recording head 100 when viewed from the liquid ejection surface 112 side is not limited to a substantially parallelogram, and may be a rectangular shape, a trapezoidal shape, a polygonal shape, or the like.

  Thus, by arranging a plurality of ink jet recording heads 100 to form the ink jet recording head unit 3, it is possible to improve the manufacturing yield, ease of processing, and flattening of the flat surface of the cover 130 which is a fixed plate. There is an effect.

  The cover 130 corresponds to the fixed plate of the present embodiment, and is made of a plate-like member such as metal. The cover 130 is provided on the liquid ejecting surface 112 side of the ink jet recording head 100, that is, on the Z1 side in the third direction Z of the ink jet recording head 100.

The cover 130 is formed by bending a flat plate-like member, and a base portion 131 provided on the liquid ejection surface 112 side and both ends of the base portion 131 in the second direction Y are in the third direction. And a bent portion 132 bent to the Z2 side of Z.
As shown in FIG. 5, the base portion 131 is joined to the surface on the Z1 side in the third direction Z of the holder 120, that is, the end surface on the Z1 side of the foot portion 122 via an adhesive 141.

  Further, as shown in FIG. 6, the base portion 131 is provided with an exposed opening 133 for opening the nozzle openings 111 of the head main bodies 110. In the present embodiment, the exposure opening 133 is provided so as to open independently for each head body 110. That is, since the ink jet recording head 100 of the present embodiment has six head bodies 110, the base portion 131 is provided with six independent exposure openings 133. Of course, depending on the configuration of the head main body 110 and the like, one common exposed opening 133 may be provided for the head main body group including a plurality of head main bodies 110.

In the present embodiment, since the foot part 122 is not provided in the second direction Y of the holding part 121, the exposed opening 133 is provided in the vicinity of the bent part 132 in the second direction Y. . That is, the distance from the entire circumference of the base portion 131 to the exposed opening 133 is smaller in the second direction Y than in the first direction X.
Such a base portion 131 covers the Z1 side of the holding portion 121 of the holder 120.

  Further, the bent portions 132 are provided at both ends of the base portion 131 in the second direction Y, and are formed to have a size that covers the opening area that opens on the side surface of the holding portion 121 in the second direction Y. . That is, the bent portion 132 is a region from the end portion of the base portion 131 in the second direction Y to the edge portion of the cover 130. And such a bending part 132 is joined to the side surface of the holder 120 in the second direction Y via an adhesive 141. Thereby, the opening to the side surface of the holding portion 121 in the second direction Y is covered and sealed by the bent portion 132.

  That is, the holder 120 and the cover 130 are bonded to each other in the first direction X by the adhesive 141 between the end surface of the foot portion 122 in the third direction Z and the base portion 131, and on the both sides in the second direction Y. The head main body 110 is disposed in the holding portion 121 that is a space between the holder 120 and the cover 130 by bonding the opening side surface of the holding portion 121 and the bent portion 132 with the adhesive 141. That is, the adhesive 140 that bonds the head main body 110 and the holder 120 is included in the holding portion 121 that is a space formed by bonding the holder 120 and the cover 130 with the adhesive 141. Therefore, even if the adhesive 140 that easily allows moisture contained in the ink to pass therethrough is used as the adhesive 140 that bonds the holder 120 and the head body 110, the holding portion 121 is bonded by the adhesive 141 that bonds the holder 120 and the cover 130. Since the inside is sealed, evaporation of moisture contained in the ink can be suppressed. In order to seal the inside of the holding part 121, it is preferable to bond the base part 131 of the cover 130 and the liquid ejecting surface 112 side of the head main body 110. That is, it is preferable that the periphery of the exposed opening 133 is bonded to the head body 110 so that moisture does not evaporate to the outside through the exposed opening 133. Further, the adhesive 141 that bonds the holder 120 and the cover 130 adheres the holder 120 and the head main body 110 and is less likely to transmit moisture than the adhesive 140 that absorbs the height variation of the head main body 110. It is preferable to do this.

  As described above, in this embodiment, the cover 130 and the holder 120 are bonded to each other by providing the cover 130 with the bent portions 132 on both sides in the second direction Y of the holder 120. On both sides in the second direction Y, there is no need for a foot portion for bonding with the base portion 131 of the cover 130. For this reason, when the ink jet recording heads 100 are arranged in the second direction Y, there is no foot between the ink jet recording heads 100 adjacent to each other. The interval between the recording heads 100 can be reduced. Accordingly, the head main bodies 110 of the ink jet recording heads 100 adjacent in the second direction Y can be provided close to each other, and the nozzle openings 111 provided in the head main bodies 110 of the adjacent ink jet recording heads are provided in the first direction. 2 in the vicinity of the direction Y.

  Incidentally, in order to suppress evaporation of moisture contained in the ink without providing the bent portions 132 bonded to the holder 120 on both sides of the cover 130 in the second direction Y, the second direction Y of the holder 120 is used. It is necessary to provide foot portions on both sides of the foot portion and to bond the end surface on the Z1 side of the foot portion to the base portion 131. That is, it is necessary to provide the holding portion 121 so as to open only on the Z1 side in the third direction Z. When the foot portions are provided on both sides in the second direction Y in this way, the interval between the holding portions 121 of the adjacent ink jet recording heads 100 is widened, and the head main body 110 of the adjacent ink jet recording head 100 is brought close to each other. It cannot be provided, and the nozzle openings 111 are arranged away from each other in the second direction Y. That is, in order to provide the ink jet recording heads 100 adjacent to each other and to provide the head main bodies 110 of the ink jet recording heads 100 close to each other, the feet 122 are arranged in the direction in which the ink jet recording heads 100 are arranged side by side. It is better not to provide both sides of the second direction Y. Therefore, the holding unit 121 has openings on both side surfaces in the second direction Y that communicate with the space in which the head main body 110 is disposed. In such a configuration, when the cover 130 is bonded only to the end surface on the Z1 side of the foot portion 122 of the holder 120, the inside of the holding portion 121 opens to the outside on both side surfaces in the second direction Y, and the holder 120 and the head Moisture that has passed through the adhesive 140 that bonds the main body 110 evaporates to the outside.

  In the present embodiment, in order to provide the head main body 110 close to each other, the holding portions 121 opened on both side surfaces in the second direction Y are sealed with the bent portions 132 of the cover 130, thereby Without providing feet on both sides, the interval between the ink jet recording heads 100 adjacent to each other in the second direction Y can be reduced, and the nozzle openings 111 of the adjacent ink jet recording heads 100 can be provided close to each other. In addition, evaporation of moisture that has passed through the adhesive 140 that bonds the head main body 110 and the holder 120 can be suppressed.

  In the present embodiment, the concave portion 123 is provided on the side surface of the holder 120 in the second direction Y, and the bent portion 132 is bonded to the concave portion 123. The concave portion 123 is provided to be opened on both side surfaces in the second direction Y, and is provided to be opened on the Z1 side surface in the third direction Z. By providing the holder 120 with the concave portion 123 in this manner, the bent portion 132 is inserted into the concave portion 123 and bonded thereto, so that the holder 120 and the bent portion 132 of the cover 130 can be easily bonded. That is, since the concave portion 123 is provided in the holder 120, the adhesive 141 is simply applied to the holder 141 between the end portion of the bent portion 132 of the cover 130 inserted into the concave portion 123 and the concave portion 123. 120 and the bent portion 132 of the cover 130 are filled by capillary force, so that there is no concave portion 123, and the surface between the holder 120 and the bent portion 132 has a different direction along the end of the bent portion 132. The process of applying the adhesive 141 is not necessary, and the bonding process can be simplified. Further, in the present embodiment, by providing the concave portion 123 in the holder 120, the protruding amount in the second direction Y of the bent portion 132 of the cover 130 is reduced, and the ink jet recording heads 100 adjacent to each other in the second direction Y. Between the nozzle openings 111 of adjacent ink jet recording heads 100 can be further narrowed. Further, by providing the holder 120 with the concave portion 123 and inserting the bent portion 132 into the concave portion 123, the amount of protrusion of the bent portion 132 in the second direction Y can be reduced even if the bending angle of the bent portion 132 varies. Since it can be made small, it can suppress that the bending part 132 interferes with the adjacent inkjet recording head 100. FIG. Also by this, the interval between the ink jet recording heads 100 adjacent to each other can be reduced.

  As described above, in the head unit 3 of this embodiment, when a plurality of ink jet recording heads 100 are arranged in the second direction Y on the head fixing substrate 200, the ink jets adjacent to each other in the second direction Y by the spacer 300. Since the interval between the recording heads 100 can be reduced, the interval between the nozzle openings 111 of the adjacent inkjet recording heads 100 can be reduced. Further, since the interval between the nozzle openings 111 of the adjacent ink jet recording heads 100 can be narrowed, a plurality of ink jet recording heads 100 can be arranged side by side on a straight line extending in the second direction Y. 3 in the first direction X can be reduced. Incidentally, if the ink jet recording heads 100 are arranged in a straight line in the second direction Y, when the ink jet recording heads 100 cannot be provided close to the second direction Y, the respective nozzle openings 111 of the plurality of ink jet recording heads 100 are arranged. In order to continuously arrange dots formed by landing ink ejected from the recording sheet S at the same interval in the second direction Y, the ink jet recording heads 100 are staggered in the second direction Y. Need to be placed in. Here, the arrangement of the ink jet recording heads 100 in a staggered manner in the second direction Y means that the ink jet recording heads 100 arranged in parallel in the second direction Y are alternately shifted in the first direction X. That is, two rows of the ink jet recording heads 100 arranged in parallel in the second direction Y are arranged in two rows in the first direction X. When the ink jet recording heads 100 are arranged in a staggered manner as described above, the width of the head unit 3 in the first direction X is increased. When the width of the head unit 3 in the first direction X increases, the distance in the first direction X between the first transport roller 5 and the second transport roller 6 in the ink jet recording apparatus 1 shown in FIG. As a result, the posture of the recording sheet S becomes difficult to be fixed, and the head unit 3 and the ink jet recording apparatus 1 are increased in size.

  In this embodiment, since the width of the head unit 3 in the first direction X can be reduced, the distance in the first direction X between the first transport roller 5 and the second transport roller 6 is shortened. This makes it possible to easily fix the posture of the recording sheet S and improve the printing quality. In addition, the head unit 3 and the ink jet recording apparatus 1 can be reduced in size.

(Embodiment 2)
FIG. 7 is a cross-sectional view of a main part of an ink jet recording head which is an example of a liquid jet head unit according to Embodiment 2 of the present invention. In addition, the same code | symbol is attached | subjected to the member similar to Embodiment 1 mentioned above, and the overlapping description is abbreviate | omitted.
As shown in FIG. 7, the head unit 3 of this embodiment includes an ink jet recording head 100 </ b> A, a head fixing substrate 200, and a spacer 300.

  In the ink jet recording head 100, a flange portion 106 is provided on the Z2 side, which is opposite to the liquid ejecting surface 112 in the third direction Z, so as to protrude in the second direction Y from the liquid ejecting surface 112 side. Is provided.

  In the third direction Z, the flange portion 106 is disposed at a height that does not interfere with the first transport roller 5 and the second transport roller 6 provided on both sides of the head unit 3 in the first direction X. Yes. Further, a first recess 101 is provided on the Z2 side of the flange portion 106.

  The spacer 300 is arranged such that a part of the spacer 300 is outside the outer shape on the liquid ejection surface 112 side of the ink jet recording head 100A in the first direction X that is the conveyance direction of the recording sheet S. ing. Further, the spacer 300 of the present embodiment is detachably fixed to the flange portion 106 by a first screw member 401 (not shown). In the present embodiment, the entire spacer 300 is arranged outside the outer shape on the liquid ejection surface 112 side of the ink jet recording head 100A in the first direction X.

  As described above, by disposing at least a part of the spacer 300 outside the outer shape of the ink jet recording head 100A on the liquid ejection surface 112 side in the first direction X, the two spacers 300 are arranged in the first direction X. Can be done at wide intervals. Therefore, when the inclination angle of the liquid ejection surface 112 is adjusted by the spacers 300 having different heights in the first direction, all the spacers 300 in the first direction X are located on the liquid ejection surface 112 side of the ink jet recording head 100A. The tilt angle of the liquid ejection surface 112 can be adjusted with higher accuracy than in the case of being inside the outer shape. That is, the outer shape on the liquid ejection surface 112 side of the ink jet recording head 100A is the outer shape at a position where the first conveying roller 5 and the second conveying roller 6 interfere with each other as in the first embodiment. It is.

  In the present embodiment, the head unit 3 is enlarged in the first direction X by the amount of the flange 106, but the enlarged flange 106 and the spacer 300 are connected to the first transport roller 5. Since it is provided at a position that does not interfere with the second transport roller 6, the distance in the first direction X between the first transport roller 5 and the second transport roller 6 does not increase, and the recording sheet S It is possible to suppress the difficulty in fixing the posture.

  The spacer 300 of the present embodiment is detachably fixed to the flange portion 106 by a first screw member 401 (not shown), but may be detachably fixed to the flange portion 106 by a second screw member 402. .

(Embodiment 3)
FIG. 8 is a cross-sectional view of a main part of an ink jet recording head unit which is an example of a liquid jet head unit according to Embodiment 3 of the invention. In addition, the same code | symbol is attached | subjected to the member similar to embodiment mentioned above, and the overlapping description is abbreviate | omitted.

As shown in FIG. 8, the head unit 3 includes a plurality of ink jet recording heads 100, a head fixing substrate 200, and a fastening member 310 that is a variable height fixing means.
The ink jet recording head 100 is detachably fixed to the head fixing substrate 200 via a fastening member 310.

  Here, the fastening member 310 includes a fourth screw member 311 that is screwed to the ink jet recording head 100 and a fifth screw member 312 that is screwed to the Z2 side surface of the fourth screw member 311.

  The fastening member 310 is detachably fixed to the ink jet recording head 100 by screwing the fourth screw member 311 into the first fixing hole 103 provided on the Z2 side surface of the ink jet recording head 100. The That is, the fastening member 310 is detachably fixed by screwing from the opposite surface side of the fastening member 310 to the ink jet recording head 100.

  Further, the fourth screw member 311 of the fastening member 310 is provided with a fourth fixing hole 313 that opens to the surface on the Z2 side. Then, the fifth screw member 312 is inserted from the side opposite to the fixing surface 201 of the head fixing substrate 200, and the fifth screw member 312 is screwed into the fourth fixing hole 313 of the fourth screw member 311. The four screw member 311 is detachably fixed to the fixing surface 201 of the head fixing substrate 200. That is, the fastening member 310 is detachably fixed by the fourth screw member 311 by screwing from the Z2 side of the head fixing substrate 200.

  In this way, the fastening member 310 is detachably fixed to the ink jet recording head 100, and the fastening member 310 is detachably fixed to the head fixing substrate 200, so that the ink jet recording head 100 can be easily removed from the head fixing substrate 200. It can be attached and detached.

  In the present embodiment, the height of the liquid ejecting surface 112 of the ink jet recording head 100 is adjusted and the height of the liquid ejecting surface 112 is adjusted by adjusting the screwing amount of the fourth screw member 311 to the ink jet recording head 100. The tilt can be adjusted. That is, it is not necessary to prepare a plurality of spacers 300 having different thicknesses as in the first embodiment described above, and the liquid of the ink jet recording head 100 can be obtained simply by providing at least three fastening members 310 in one ink jet recording head 100. The height and inclination of the ejection surface 112 can be adjusted, and the cost can be reduced.

(Other embodiments)
As mentioned above, although one Embodiment of this invention was described, the basic composition of this invention is not limited to what was mentioned above.
For example, in each of the above-described embodiments, the spacer 300 is provided so as not to protrude from the outer shape in the second direction Y of the ink jet recording heads 100 and 100A. May be provided so as to protrude from the outer shape in the second direction Y of the ink jet recording heads 100 and 100A.

  Further, by providing at least three variable height fixing means such as the spacer 300 and the fastening member 310 for one ink jet recording head 100, 100A, the first direction X and the second direction of the liquid ejecting surface 112 are provided. Although the inclination of the direction Y in both directions can be adjusted, of course, the present invention is not limited to this, and two spacers 300, fastening members 310, etc. may be provided for one ink jet recording head 100, 100A. Good. Accordingly, it is possible to adjust the inclination of the liquid ejection surface 112 in only one of the first direction X and the second direction Y. Of course, one spacer 300 or the like may be provided for one ink jet recording head 100 or 100A.

  Further, in each of the above-described embodiments, the height-variable fixing means such as the spacer 300 and the fastening member 310 are the second screw from the Z2 side in the third direction Z, which is the side opposite to the ink jet recording heads 100 and 100A. The screw is fixed by the member 402, the fifth screw member 312 or the like, but is not particularly limited thereto. For example, the spacer 300, the fastening member 310 or the like is moved in the first direction X with respect to the ink jet recording heads 100 and 100A. Alternatively, it is arranged in the second direction Y, and is attached or detached by screwing from the opposite side of the ink jet recording head 100, 100A such as the spacer 300 or the fastening member 310, that is, from the first direction X or the second direction Y. It may be fixed as possible. Further, the spacer 300 and the fastening member 310 may not be removed from the ink jet recording heads 100 and 100A. That is, even if the spacer 300 and the fastening member 310 are fixed to the ink jet recording heads 100 and 100A so that they cannot be easily removed by adhesion or the like, the ink jet recording heads 100 and 100A can be detached from the head fixing substrate 200. It becomes.

  Further, in each of the above-described embodiments, the ink jet recording heads 100, 100A and the like have exemplified the configuration including the head main body 110, the holder 120, and the cover 130. However, the invention is not particularly limited thereto, and other These members may be provided. Further, although the filter 501 is provided in the holder 120, of course, the filter 501 may not be provided. When the ink jet recording heads 100 and 100A are not provided with the filter 501, a filter may be provided between the liquid storage means and the ink jet recording heads 100 and 100A. Similarly, the first member 125 and the second member 126 constituting the holder 120 may be fixed in a state where they cannot be easily removed by bonding or the like. Of course, the first member 125 and the second member 126 may be fixed by screwing from the opposite side of the second member 126 to the first member 125.

  In the first embodiment described above, the juxtaposition direction of the plurality of ink jet recording heads 100 held by the head fixing substrate 200 is a direction perpendicular to the first direction X that is the conveyance direction of the recording sheet S. Although the second direction Y is set to a certain value, the present invention is not particularly limited thereto, and a head unit in which the inkjet recording heads 100 are arranged in the longitudinal direction of the head fixing substrate 200 is arranged in a direction in which the plurality of inkjet recording heads 100 are You may arrange | position so that it may become an angle which intersects the 1st direction X which is the conveyance direction of the recording sheet S, ie, an angle smaller than 90 degree | times with respect to the 1st direction X. At this time, in the in-plane direction of the liquid ejecting surface 112, even if the nozzle row is provided in a direction perpendicular to the longitudinal direction of the head fixing substrate 200, the first head which is the transport direction can be obtained by tilting the entire head unit. A nozzle row inclined with respect to the direction X can be arranged.

  Further, in each of the above-described embodiments, the fourth direction Xa that is the direction in which the nozzle openings 111 of the head body 110 are arranged is inclined with respect to the second direction Y that is orthogonal to the first direction X that is the transport direction. However, the fourth direction Xa, which is the juxtaposed direction of the nozzle openings 111, may be the same direction as the first direction X, which is the transport direction. The fourth direction Xa, which is the direction in which the nozzle openings 111 are arranged, may be the same direction as the second direction Y. Further, the nozzle openings 111 are not limited to those provided in a row, and the nozzle openings 111 may be arranged in a matrix. Furthermore, in the first embodiment described above, the holder 120 has a substantially parallelogram shape when viewed in plan from the third direction Z perpendicular to the liquid ejection surface 112. It may be a shape, a trapezoidal shape, a polygonal shape, or the like. Here, such an example is shown in FIG. FIG. 9 is a plan view from the liquid ejecting surface side of an ink jet recording head unit which is an example of a liquid ejecting head unit according to another embodiment of the present invention.

  As shown in FIG. 9, the ink jet recording head 100 </ b> B has a trapezoidal shape when viewed from the liquid ejecting surface 112 side. Further, the plurality of ink jet recording heads 100B are arranged in parallel in the second direction Y and fixed to the head fixing substrate 200, and one ink jet recording head 100B arranged in parallel in the second direction Y is provided. In other words, the liquid ejecting surface 112 is rotated 180 degrees in the in-plane direction.

In such an ink jet recording head 100 </ b> B, nozzle openings 111 are arranged in a matrix on the liquid ejection surface 112. Even in such a configuration, as in the above-described embodiments, the ink jet recording head 100B is detachably provided on the head fixing substrate 200 using the spacer 300, the fastening member 310, and the like that are variable height fixing means. Thus, the same effect as that of the above-described embodiment can be obtained.
Note that the nozzle openings 111 may be arranged in a matrix even in the ink jet recording heads 100 and 100A of the above-described embodiments.

  In the above-described example, the ink jet recording heads 100, 100 </ b> A, 100 </ b> B are adjacent to each other in the second direction Y when viewed from the third direction Z orthogonal to the liquid ejecting surface 112. The outer shape serving as the boundary is provided to be inclined with respect to the first direction X, which is the conveyance direction of the recording sheet S, but of course not limited to this, and the ink jet recording heads adjacent in the second direction Y May be provided along the conveyance direction of the recording sheet S.

  Furthermore, in Embodiment 1 described above, as the ink jet recording apparatus 1, a so-called line recording apparatus in which the head unit 3 is fixed to the apparatus main body 2 and printing is performed simply by transporting the recording sheet S is exemplified. The head unit 3 is mounted on a carriage that moves in a direction that intersects the first direction X that is the conveyance direction of the recording sheet S, for example, the second direction Y. The present invention can also be applied to a so-called serial type recording apparatus that performs printing while moving in a direction crossing the transport direction. Further, the recording sheet S is not limited to the configuration for conveying the recording sheet S to the head unit 3, and printing may be performed by a configuration in which the head unit 3 is moved relative to the recording sheet S. Can be relatively conveyed.

  In the above embodiment, an ink jet recording head unit has been described as an example of a liquid ejecting head unit, and an ink jet recording apparatus has been described as an example of a liquid ejecting apparatus. In addition, the present invention is intended for all liquid ejecting apparatuses, and can of course be applied to liquid ejecting head units and liquid ejecting apparatuses that eject liquids other than ink. Other liquid ejecting heads include, for example, various recording heads used in image recording apparatuses such as printers, color material ejecting heads used in the manufacture of color filters such as liquid crystal displays, organic EL displays, and FEDs (field emission displays). Examples thereof include an electrode material ejecting head used for electrode formation, a bio-organic matter ejecting head used for biochip production, and the like, and can also be applied to a liquid ejecting head unit and a liquid ejecting apparatus provided with such a liquid ejecting head.

  DESCRIPTION OF SYMBOLS 1 Inkjet recording device (liquid ejecting apparatus), 3 Inkjet recording head unit (liquid ejecting head unit), 4 Conveying means, 5 First conveying roller, 6 Second conveying roller, 7 Support member, 100, 100A, 100B Inkjet recording head (liquid ejecting head), 110 head main body, 120 holder, 121 holding part, 122 foot part, 123 concave part, 130 cover (fixing plate), 131 base part, 132 bent part, 140, 141 adhesive, 200 head fixing substrate, 300 spacer (variable height fixing means), 310 fastening member (height variable fixing means), 401 first screw member, 402 second screw member, 403 third screw member, 500 flow path, 501 filter

Claims (10)

A liquid ejecting head having a liquid ejecting surface on which nozzle openings for ejecting liquid are formed;
A head fixing substrate that holds a surface opposite to the liquid ejecting surface of the plurality of liquid ejecting heads;
A variable height fixing means provided between the head fixing substrate and the liquid ejecting head and capable of adjusting a distance between the head fixing substrate and the liquid ejecting head;
The height variable fixing means is detachably fixed to a surface opposite to the liquid ejecting surface of the liquid ejecting head,
The variable height fixing means and the head fixing substrate can be attached and detached by screwing from the side opposite to the fixing surface for fixing the liquid jet head of the head fixing substrate via the variable height fixing means. A liquid ejecting head unit, which is fixed. A plurality of the liquid jet heads are arranged in parallel on the head fixing substrate,
When viewed from a direction orthogonal to the liquid ejecting surface, the outer shape that forms a boundary on the liquid ejecting surface side of the liquid ejecting heads adjacent to each other in the juxtaposed direction of the liquid ejecting heads is relative to the medium to be ejected. The liquid ejecting head unit according to claim 1, wherein the liquid ejecting head unit is provided to be inclined with respect to the moving direction. A plurality of the liquid jet heads are arranged in parallel on the head fixing substrate,
When viewed from a direction perpendicular to the liquid ejecting surface, the variable height fixing means for each liquid ejecting head is disposed at a position that fits within the outer shape of the liquid ejecting head in the direction in which the liquid ejecting heads are arranged side by side. The liquid ejecting head unit according to claim 1, wherein the liquid ejecting head unit is provided. A plurality of liquid jet heads are arranged in parallel on the head fixing substrate,
When viewed from a direction perpendicular to the liquid ejecting surface, at least a part of the height variable fixing means for each liquid ejecting head is configured to eject the liquid ejecting head of the liquid ejecting head in the relative movement direction of the ejection target medium. The liquid ejecting head unit according to claim 1, wherein the liquid ejecting head unit is provided on an outer side than an outer shape on a surface side.   The liquid ejecting head unit according to claim 1, wherein at least three of the height variable fixing units are provided for each liquid ejecting head.   The surface on which the variable height fixing means and the liquid ejecting head abut is positioned closer to the liquid ejecting surface than the end of the liquid ejecting head on the head fixing substrate side in the direction orthogonal to the liquid ejecting surface. The liquid ejecting head unit according to claim 1, wherein the liquid ejecting head unit is a liquid ejecting head unit.   The variable height fixing means and the liquid ejecting head are detachably fixed by screwing from the opposite surface side of the variable height fixing means to the liquid ejecting head. The liquid jet head unit according to any one of? The liquid ejecting head includes a first member and a second member provided with a flow path,
The height fixing variable means is fixed to the first member,
The first member and the second member are detachably fixed,
The liquid ejecting head unit according to claim 1, wherein the first member is provided with a filter that traverses the flow path.   The liquid ejecting head unit according to claim 8, wherein the first member and the second member are fastened by screwing from the opposite surface side of the first member to the second member.   A liquid ejecting apparatus comprising the liquid ejecting head unit according to claim 1.

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